NNLO QCD predictions for $t\bar t W$ production at hadron colliders

Matteo Becchetti; Dhimiter Canko; Xiang Chen; Vsevolod Chestnov; Maximilian Delto; Sara Ditsch; Massimiliano Grazzini; Stefan Kallweit; Tiziano Peraro; Mattia Pozzoli; Chiara Savoini; Lorenzo Tancredi; Simone Zoia

arXiv · 2606.09503

NNLO QCD predictions for $t\bar t W$ production at hadron colliders

Matteo Becchetti·Dhimiter Canko·Xiang Chen·Vsevolod Chestnov·Maximilian Delto·Sara Ditsch·Massimiliano Grazzini·Stefan Kallweit·Tiziano Peraro·Mattia Pozzoli·Chiara Savoini·Lorenzo Tancredi·Simone Zoia

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Abstract

The production of a top-antitop quark pair in association with a $W$ boson constitutes one of the heaviest final states currently studied at the Large Hadron Collider (LHC) at CERN. Measurements of its production rate have consistently exceeded Standard Model predictions. Owing to the complexity of the two-loop amplitudes entering the double-virtual correction, next-to-next-to-leading-order (NNLO) QCD calculations for this process have so far employed dynamical approximations for the two-loop contribution. We present NNLO QCD predictions based, for the first time, on a direct computation of the required two-loop amplitudes in the generalised leading-colour limit.

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Matteo Becchetti, Dhimiter Canko, Xiang Chen, Vsevolod Chestnov, Maximilian Delto, Sara Ditsch, Massimiliano Grazzini, Stefan Kallweit, Tiziano Peraro, Mattia Pozzoli, Chiara Savoini, Lorenzo Tancredi, Simone Zoia. 2026-06-08. NNLO QCD predictions for $t\bar t W$ production at hadron colliders. https://arxiv.org/abs/2606.09503

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